Hi All,
I found 2048-byte slab heavy users. 8MB doesn't seem much they all
add up.
size-2048 before:98 after:4095 diff:3997 size:2060 incr:8233820
The problem is with
sd.c: sd_attach()
alloc_disk(16)
alloc_disk() allocates "hd_struct" structure for 15 minors.
So it is a 84*15 = 1260 byte allocation. They all come from
2048-byte slabs. Since I have 4000 simulated disks, it uses up 8MB.
Proposed fixes:
1) Make the allocations come from its own slab, instead of
2048-byte slab. (~40% saving).
2) Instead of allocatinf hd_struct structure for all possible partitions,
why not allocated them dynamically, as we see a partition ? This
way we could (in theory) support more than 16 partitions, if needed.
Are there any issues with doing (2) ?
Thanks,
Badari
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This archive was generated by hypermail 2b29 : Mon Mar 31 2003 - 22:00:32 EST